CN103042389A - Precise forging-continuous rolling production technology of large and heavy single molybdenum rod - Google Patents
Precise forging-continuous rolling production technology of large and heavy single molybdenum rod Download PDFInfo
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- CN103042389A CN103042389A CN2013100324769A CN201310032476A CN103042389A CN 103042389 A CN103042389 A CN 103042389A CN 2013100324769 A CN2013100324769 A CN 2013100324769A CN 201310032476 A CN201310032476 A CN 201310032476A CN 103042389 A CN103042389 A CN 103042389A
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Abstract
The invention provides a precise forging-continuous rolling production technology of a large and heavy single molybdenum rod. The production technology comprises the following steps of: 1, carrying out billet forging on the molybdenum rod by a precision forging machine to obtain a precision forging bar; 2, heating the precision forging bar; 3, rolling for the first time by a Y-shaped three-roller continuous mill to obtain a rolled molybdenum rod; 4, heating the rolled molybdenum rod; and 5, rolling for the second time by the Y-shaped three-roller continuous mill and obtaining the large and heavy single molybdenum rod of which the piece weight is 45-50kg. Deep processing of a molybdenum bar is successfully achieved by setting and optimizing each parameter in precision forging, thermal treatment and continuous rolling processes; the large and heavy single molybdenum rod, which is suitable for subsequent wire drawing, and of which the piece weight is 45-50kg, is finally produced; and the production efficiency is obviously improved. The piece weight of the molybdenum rod produced by the production technology is much greater than that of the molybdenum rod produced by a traditional technology; and the precise forging-continuous rolling production technology has no welding spot on the whole, and is even in internal organization, high in product quality and suitable for large-scale industrial production.
Description
Technical field
The invention belongs to the Molybdenum metal materials industry processing technique field, be specifically related to a kind of finish forge of large piece weight molybdenum bar-rolling production technique.
Background technology
Molybdenum filament is generally processed by molybdenum rod, and domestic traditional molybdenum rod production method mainly contains " the sintering molybdenum bar revolves hammer cogging-drawing " method and " rolling-cogging-drawing of sintering molybdenum bar " method.Compare with external similar molybdenum rod product, the substance that adopts the molybdenum rod of " the sintering molybdenum bar revolves hammer cogging-drawing " method production is that the weight of single molybdenum rod only is about 1kg, and the substance of the molybdenum rod that employing " rolling-cogging-drawing of sintering molybdenum bar " method is produced is less than 14kg; And the molybdenum rod of produced in conventional processes is because substance is little, and the molybdenum filament length that processing obtains is short, causes the production of large piece weight molybdenum silk will carry out repeatedly butt welding, because solder joint tissue and normal molybdenum rod are organized inconsistent and the quality of welding spot problem, easily causes the quality problems of molybdenum filament.Therefore, need a kind of production technology that can the high-quality large piece weight molybdenum bar of steady production of exploitation badly.
Up to now, not yet find adopting finish forge-continuous rolling process to produce substance is that the correlative study of the large piece weight molybdenum bar of 45kg～50kg is seen in report.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of finish forge of large piece weight molybdenum bar-rolling production technique is provided.This production technology is by setting and optimization to each parameter in each technical process of finish forge, heat treated and tandem rolling, successfully realized the deep processing to the molybdenum bar base, finally preparing substance is 45kg～50kg, and is applicable to the large piece weight molybdenum bar of follow-up wire drawing, and production efficiency significantly improves.Adopt the substance of molybdenum rod of this explained hereafter up to 45kg～50kg, whole no-welding-spot, interior tissue is even, and product quality is high, is suitable for large-scale industrial production.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of finish forge of large piece weight molybdenum bar-rolling production technique, it is characterized in that, and this technique may further comprise the steps:
Step 1, to adopt precise forging machine be that the molybdenum bar base of 85mm～90mm carries out cogging and forges with diameter of section, and obtaining diameter of section is the smart forging rod billet of 48mm～49mm; Described cogging is forged and is adopted the axially forging mode of pulling, and the initial forging temperature that described cogging is forged is 1450 ℃～1500 ℃, and the final forging temperature that described cogging is forged is 1150 ℃～1200 ℃;
Step 2, employing intermediate-frequency heating furnace are heated to smart forging rod billet described in the step 1 and are incubated 16min～17min after temperature is 1450 ℃～1500 ℃;
Step 3, the smart forging rod billet after adopting Y type three-roller continuous rolling mill with heating in the step 2 are to carry out first rollingly under 1450 ℃～1500 ℃ the condition beginning to roll temperature, obtain rolling molybdenum rod; The described first rolling finishing temperature is 1100 ℃～1150 ℃, and the cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm～16mm;
Step 4, employing intermediate-frequency heating furnace are heated to rolling molybdenum rod described in the step 3 and are incubated 1min～2min after temperature is 1250 ℃～1300 ℃;
Step 5, the rolling molybdenum rod after adopting Y type three-roller continuous rolling mill with heating in the step 4 are to carry out second rollingly under 1250 ℃～1300 ℃ the condition beginning to roll temperature, and obtaining substance is the large piece weight molybdenum bar of 45kg～50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7mm～8mm.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the base of molybdenum bar described in the step 1 is sintered state molybdenum bar base.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the forging of cogging described in the step 1 is divided into 3 passages and finishes.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the time that is heated to temperature in the step 2 and is 1450 ℃～1500 ℃ is 3min～4min.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the type of Y described in step 3 three-roller continuous rolling mill is Y370 type three-roller continuous rolling mill.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the first rolling 11 passages that are divided into are finished described in the step 3.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the type of Y described in step 5 three-roller continuous rolling mill is Y250 type three-roller continuous rolling mill.
The finish forge of above-mentioned a kind of large piece weight molybdenum bar-rolling production technique is characterized in that, the second rolling 8 passages that are divided into are finished described in the step 5, and the described second rolling finishing temperature is 1100 ℃～1150 ℃.
The present invention compared with prior art has the following advantages:
(1) finish forge of large piece weight molybdenum bar of the present invention-rolling production technique is present domestic article one automatic production line; The present invention is through a large amount of practical studies, and pass through setting parameter and optimization in each technical process of finish forge, heat treatment and tandem rolling, successfully realized the deep processing to the molybdenum bar base, finally preparing substance is 45kg～50kg and the large piece weight molybdenum bar that is applicable to follow-up wire drawing, and production efficiency significantly improves.
(2) the present invention at first carries out the cogging finish forge to the molybdenum bar base, is conducive to reduce the Microstructure and properties difference of excellent base limit section and core; And the final forging temperature of control cogging finish forge is 1150 ℃～1200 ℃, is conducive to reduce the generation of the defectives such as excellent base face crack, guarantees simultaneously service life, Decrease production cost and the labour intensity of precise forging machine tup.
(3) the present invention carries out heating to eliminate stress behind the cogging finish forge to the molybdenum bar base, reduces the stress concentration phenomenon of forging process; To be heated to temperature be 1450 ℃～1500 ℃ and be incubated, so that smart forging rod billet perfect recrystallization annealing, provides effectively and guarantee for having enough plasticity in the follow-up operation of rolling.
(4) the present invention adopts Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule) and Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule) to be rolled, flat triangle pass schedule not only has larger passage lengthening coefficient, can so that the sectional area of rolled piece reduce rapidly, enhance productivity, and can make the rolled piece interior tissue even, improve product quality; Simultaneously, adopt flat triangle pass schedule grinding roller convenient, the pass machining precision is high, can greatly reduce roll wear.
(5) finish forge of large piece weight molybdenum bar of the present invention-rolling production technique is full-automatic process, significantly be better than traditional swage production technology and traditional Rolling Production technique, greatly improve the production efficiency of molybdenum rod, effectively reduced the contamination phenomenon in the production process simultaneously.
(6) adopt the substance of the molybdenum rod that the present invention produces can reach 45kg～50kg, be far longer than tradition swage the substance 1kg of technique and the substance 14kg of traditional rolling mill practice, whole no-welding-spot has effectively guaranteed product quality.
Below in conjunction with drawings and Examples the present invention is described in further detail.
Description of drawings
Fig. 1 is process chart of the present invention.
Fig. 2 is the horizontal organization figure of the large piece weight molybdenum bar of the embodiment of the invention 1 production.
Fig. 3 is the figure of longitudinal tissue of the large piece weight molybdenum bar of the embodiment of the invention 1 production.
The specific embodiment
Embodiment 1
In conjunction with Fig. 1, the finish forge of the present embodiment large piece weight molybdenum bar-rolling production technique may further comprise the steps:
Step 1, to adopt precise forging machine be that the sintered state molybdenum bar base of 85mm carries out cogging and forges with diameter of section, the axially forging mode of pulling that adopts is forged in described cogging, being divided into three passages finishes, the deflection data that each passage cogging is forged see Table 1, the initial forging temperature that cogging is forged is 1450 ℃, the final forging temperature that cogging is forged is 1150 ℃, and obtaining diameter of section is the smart forging rod billet of 48mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deflection data that the cogging of table 1 the present embodiment is forged
| Forge passage | The first passage | The second passage | The 3rd passage |
| Deflection (%) | 26.2 | 39.0 | 29.1 |
Step 2, employing intermediate-frequency heating furnace are heated to smart forging rod billet described in the step 1 and are incubated 16min after temperature is 1450 ℃; The time that is heated to temperature and is 1450 ℃ is 3min;
It is first rolling that step 3, the smart forging rod billet after adopting Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 2 carry out, the described first rolling 11 passages that are divided into are finished, each passage first rolling deflection data sees Table 2, it is 1450 ℃ that the first rolling beginning was rolled temperature, the first rolling finishing temperature is 1100 ℃, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm; The Y370 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce;
The deflection data that table 2 the present embodiment first is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 5.3 | 22.5 | 22.5 | 22.5 | 22.5 | 20.6 | 21.3 | 20.6 | 18.7 | 18.7 | 15.9 |
Step 4, employing intermediate-frequency heating furnace are heated to rolling molybdenum rod described in the step 3 and are incubated 1min after temperature is 1250 ℃;
It is second rolling that step 5, the rolling molybdenum rod after adopting Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 4 carry out, the described second rolling 8 passages that are divided into are finished, each passage second rolling deflection data sees Table 3, it is 1250 ℃ that the described second rolling beginning was rolled temperature, the second rolling finishing temperature is 1100 ℃, and obtaining substance is the large piece weight molybdenum bar of 45kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7.0mm; The Y250 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce.
The deflection data that table 3 the present embodiment second is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.0 | 19.4 | 19.4 | 18.7 | 18.7 | 18.7 | 18.7 | 5.7 |
Adopt the horizontal organization figure of the large piece weight molybdenum bar that the present embodiment produces as shown in Figure 2, longitudinal tissue scheme as shown in Figure 3, adopts as can be known the dense structure of the large piece weight molybdenum bar that the present embodiment produces and even by Fig. 2 and Fig. 3.
Adopt the mechanical properties data of the large piece weight molybdenum bar of the present embodiment production to see Table 10.
Embodiment 2
In conjunction with Fig. 1, the finish forge of the present embodiment large piece weight molybdenum bar-rolling production technique may further comprise the steps:
Step 1, to adopt precise forging machine be that the sintered state molybdenum bar base of 88mm carries out cogging and forges with diameter of section, the axially forging mode of pulling that adopts is forged in described cogging, being divided into three passages finishes, the deflection data that each passage cogging is forged see Table 4, the initial forging temperature that cogging is forged is 1480 ℃, the final forging temperature that cogging is forged is 1180 ℃, and obtaining diameter of section is the smart forging rod billet of 48.5mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deflection data that the cogging of table 4 the present embodiment is forged
| Forge passage | The first passage | The second passage | The 3rd passage |
| Deflection (%) | 31.2 | 39.03 | 27.6 |
Step 2, employing intermediate-frequency heating furnace are heated to smart forging rod billet described in the step 1 and are incubated 16.5min after temperature is 1480 ℃; The time of heating up in the heating process is 3.5min;
It is first rolling that step 3, the smart forging rod billet after adopting Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 2 carry out, the described first rolling 11 passages that are divided into are finished, each passage first rolling deflection data sees Table 5, it is 1480 ℃ that the first rolling beginning was rolled temperature, the first rolling finishing temperature is 1120 ℃, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 15mm; The Y370 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce;
The deflection data that table 5 the present embodiment first is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 7.2 | 21.3 | 21.3 | 20.6 | 20.6 | 20.0 | 20.0 | 19.4 | 18.0 | 18.0 | 16.0 |
Step 4, employing intermediate-frequency heating furnace are heated to rolling molybdenum rod described in the step 3 and are incubated 1.5min after temperature is 1280 ℃;
It is second rolling that step 5, the rolling molybdenum rod after adopting Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 4 carry out, the described second rolling 8 passages that are divided into are finished, each passage second rolling deflection data sees Table 6, it is 1280 ℃ that the second rolling beginning was rolled temperature, the second rolling finishing temperature is 1120 ℃, and obtaining substance is the large piece weight molybdenum bar of 48kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7.6mm; The Y250 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce.
The deflection data that table 6 the present embodiment second is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.4 | 19.4 | 18.7 | 18.7 | 18.0 | 18.0 | 18.0 | 5.7 |
The dense structure of the large piece weight molybdenum bar that employing the present embodiment is produced and even.Adopt the mechanical properties data of the large piece weight molybdenum bar of the present embodiment production to see Table 10.
Embodiment 3
In conjunction with Fig. 1, the finish forge of the present embodiment large piece weight molybdenum bar-rolling production technique may further comprise the steps:
Step 1, to adopt precise forging machine be that the sintered state molybdenum bar base of 90mm carries out cogging and forges with diameter of section, the axially forging mode of pulling that adopts is forged in described cogging, being divided into three passages finishes, the deflection data that each passage cogging is forged see Table 7, the initial forging temperature that cogging is forged is 1500 ℃, the final forging temperature that cogging is forged is 1200 ℃, and obtaining diameter of section is the smart forging rod billet of 49mm; The precise forging machine that described precise forging machine can adopt Austrian GFM company to produce;
The deflection data that the cogging of table 7 the present embodiment is forged
| Forge passage | The first passage | The second passage | The 3rd passage |
| Deflection (%) | 34.2 | 39.03 | 26.1 |
Step 2, employing intermediate-frequency heating furnace are heated to smart forging rod billet described in the step 1 and are incubated 17min after temperature is 1500 ℃; The time of heating up in the heating process is 4min;
It is first rolling that step 3, the smart forging rod billet after adopting Y370 type three-roller continuous rolling mill (this Y370 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 2 carry out, the described first rolling 11 passages that are divided into are finished, each passage first rolling deflection data sees Table 8, it is 1500 ℃ that the first rolling beginning was rolled temperature, the first rolling finishing temperature is 1150 ℃, obtains rolling molybdenum rod; The cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 16mm; The Y370 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y370 type three-roller continuous rolling mill can adopt Luoyang designing institute to produce;
The deflection data that table 8 the present embodiment first is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Deflection (%) | 9.1 | 20.6 | 20.6 | 20 | 19.4 | 18.0 | 18.0 | 17.4 | 17.4 | 17.4 | 16.0 |
Step 4, employing intermediate-frequency heating furnace are heated to rolling molybdenum rod described in the step 3 and are incubated 2min after temperature is 1300 ℃;
It is second rolling that step 5, the rolling molybdenum rod after adopting Y250 type three-roller continuous rolling mill (this Y250 type three-roller continuous rolling mill carries flat triangle pass schedule) with heating in the step 4 carry out, the described second rolling 8 passages that are divided into are finished, each passage second rolling deflection data sees Table 9, it is 1300 ℃ that the second rolling beginning was rolled temperature, the second rolling finishing temperature is 1150 ℃, and obtaining substance is the large piece weight molybdenum bar of 50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 8.0mm; The Y250 type three-roller continuous rolling mill that carries flat triangle pass schedule that described Y250 type three-roller continuous rolling mill can adopt German KOCKS company to produce.
The deflection data that table 9 the present embodiment second is rolling
| Rolling pass | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Deflection (%) | 7.4 | 19.4 | 19.4 | 19.4 | 18.7 | 18.0 | 18.0 | 5.7 |
The dense structure of the large piece weight molybdenum bar that employing the present embodiment is produced and even.Adopt the mechanical properties data of the large piece weight molybdenum bar of the present embodiment production to see Table 10.
Table 10 adopts the mechanical properties data result of the large piece weight molybdenum bar of the present invention's production
As shown in Table 10, adopting the hardness of the large piece weight molybdenum bar of the embodiment of the invention 1 to 3 production is 240HV～280HV, compression strength is 800MPa～900MPa, and percentage elongation is 10%～15%, illustrates that the large piece weight molybdenum bar that adopts the present invention to produce has good mechanical performance.
The above only is preferred embodiment of the present invention, is not that the present invention is imposed any restrictions.Every any simple modification, change and equivalence of above embodiment being done according to the invention technical spirit changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (8)
1. the finish forge of a large piece weight molybdenum bar-rolling production technique is characterized in that, this technique may further comprise the steps:
Step 1, to adopt precise forging machine be that the molybdenum bar base of 85mm～90mm carries out cogging and forges with diameter of section, and obtaining diameter of section is the smart forging rod billet of 48mm～49mm; Described cogging is forged and is adopted the axially forging mode of pulling, and the initial forging temperature that described cogging is forged is 1450 ℃～1500 ℃, and the final forging temperature that described cogging is forged is 1150 ℃～1200 ℃;
Step 2, employing intermediate-frequency heating furnace are heated to smart forging rod billet described in the step 1 and are incubated 16min～17min after temperature is 1450 ℃～1500 ℃;
Step 3, the smart forging rod billet after adopting Y type three-roller continuous rolling mill with heating in the step 2 are to carry out first rollingly under 1450 ℃～1500 ℃ the condition beginning to roll temperature, obtain rolling molybdenum rod; The described first rolling finishing temperature is 1100 ℃～1150 ℃, and the cross section of described rolling molybdenum rod is regular hexagon, and described orthohexagonal inscribed circle diameter is 14mm～16mm;
Step 4, employing intermediate-frequency heating furnace are heated to rolling molybdenum rod described in the step 3 and are incubated 1min～2min after temperature is 1250 ℃～1300 ℃;
Step 5, the rolling molybdenum rod after adopting Y type three-roller continuous rolling mill with heating in the step 4 are to carry out second rollingly under 1250 ℃～1300 ℃ the condition beginning to roll temperature, and obtaining substance is the large piece weight molybdenum bar of 45kg～50kg; The cross section of described large piece weight molybdenum bar is regular hexagon, and described orthohexagonal inscribed circle diameter is 7mm～8mm.
2. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the base of molybdenum bar described in the step 1 is sintered state molybdenum bar base.
3. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the forging of cogging described in the step 1 is divided into 3 passages and finishes.
4. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the time that is heated to temperature in the step 2 and is 1450 ℃～1500 ℃ is 3min～4min.
5. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the type of Y described in step 3 three-roller continuous rolling mill is Y370 type three-roller continuous rolling mill.
6. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the first rolling 11 passages that are divided into are finished described in the step 3.
7. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the type of Y described in step 5 three-roller continuous rolling mill is Y250 type three-roller continuous rolling mill.
8. the finish forge of a kind of large piece weight molybdenum bar according to claim 1-rolling production technique is characterized in that, the second rolling 8 passages that are divided into are finished described in the step 5, and the described second rolling finishing temperature is 1100 ℃～1150 ℃.
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| CN107931355A (en) * | 2017-11-17 | 2018-04-20 | 金堆城钼业股份有限公司 | A kind of production method of spray molybdenum wires |
| CN108356192A (en) * | 2018-04-09 | 2018-08-03 | 清华大学 | A kind of Integral die-forged method of railway frog |
| CN110000387A (en) * | 2019-05-20 | 2019-07-12 | 安泰天龙钨钼科技有限公司 | A kind of big specification fine grain tungsten bar and its two rolling preparation methods |
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| CN102615510A (en) * | 2011-02-01 | 2012-08-01 | 自贡硬质合金有限责任公司 | Molybdenum wire production continuous rolling and continuous forging cogging equipment and production method thereof |
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| CN108356192A (en) * | 2018-04-09 | 2018-08-03 | 清华大学 | A kind of Integral die-forged method of railway frog |
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